refactor: improvements to feed-data script

[diofeher]

This PR handles a few improvements to the feed-data script and to the Makefile.

• Makefile generate-registry takes a long time to run. Since we're using it for fast local environment setup, we're restricting to opentofu namespace using the ad provider;
• Wrangler r2 API does not support r2 object put for directories. We were receiving errors because of it, making the output confusing, even if it was working. I've made a refactoring to make it easier to see what the script was doing;
• Wrangler r2 API doesn't handle well concurrent requests to r2 object put. I've refactored in order to do the adding sequentially.

Checklist

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• I have not used an AI coding assistant to create this PR.
• My contribution is compatible with the MPL-2.0 license and I have provided a DCO sign-off on all my commits.
• I have written all code in this PR myself OR I have marked all code I have not written myself (including modified code, e.g. copied from other places and then modified) with a comment indicating where it came from.